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Determine Coordinate System - General
Transformation Characteristic
Points and trans-
formation parame-
ters
Points and height
transformation
Description
The transformation parameters determined depend
on the number of available points with position infor-
mation.
•
One point: Classic 2D with shift in X and Y.
•
Two points: Classic 2D with shift in X and Y, rota-
tion about Z and scale.
•
More than two points: Classic 2D with shift in X
and Y, rotation about Z, scale and residuals.
The type of height transformation performed
depends on the number of available points with
height information.
•
No point: No height transformation.
•
One point: Heights are shifted to fit to the height
control point.
•
Two points: Average height shift between the two
height control points.
•
Three points: Tilted plane through the three
height control points to approximate the local
heights.
•
More than three points: Best fitting average
plane.
GPS1200+
937
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